freebsd-dev/sys/i386/pci/pci_pir.c
John Baldwin ed95805e90 Remove support for Xen PV domU kernels. Support for HVM domU kernels
remains.  Xen is planning to phase out support for PV upstream since it
is harder to maintain and has more overhead.  Modern x86 CPUs include
virtualization extensions that support HVM guests instead of PV guests.
In addition, the PV code was i386 only and not as well maintained recently
as the HVM code.
- Remove the i386-only NATIVE option that was used to disable certain
  components for PV kernels.  These components are now standard as they
  are on amd64.
- Remove !XENHVM bits from PV drivers.
- Remove various shims required for XEN (e.g. PT_UPDATES_FLUSH, LOAD_CR3,
  etc.)
- Remove duplicate copy of <xen/features.h>.
- Remove unused, i386-only xenstored.h.

Differential Revision:	https://reviews.freebsd.org/D2362
Reviewed by:	royger
Tested by:	royger (i386/amd64 HVM domU and amd64 PVH dom0)
Relnotes:	yes
2015-04-30 15:48:48 +00:00

748 lines
20 KiB
C

/*-
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
* Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000, BSDi
* Copyright (c) 2004, John Baldwin <jhb@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_param.h>
#include <machine/md_var.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <machine/pci_cfgreg.h>
#include <machine/segments.h>
#include <machine/pc/bios.h>
#define NUM_ISA_INTERRUPTS 16
/*
* A link device. Loosely based on the ACPI PCI link device. This doesn't
* try to support priorities for different ISA interrupts.
*/
struct pci_link {
TAILQ_ENTRY(pci_link) pl_links;
uint8_t pl_id;
uint8_t pl_irq;
uint16_t pl_irqmask;
int pl_references;
int pl_routed;
};
struct pci_link_lookup {
struct pci_link **pci_link_ptr;
int bus;
int device;
int pin;
};
struct pci_dev_lookup {
uint8_t link;
int bus;
int device;
int pin;
};
typedef void pir_entry_handler(struct PIR_entry *entry,
struct PIR_intpin* intpin, void *arg);
static void pci_print_irqmask(u_int16_t irqs);
static int pci_pir_biosroute(int bus, int device, int func, int pin,
int irq);
static int pci_pir_choose_irq(struct pci_link *pci_link, int irqmask);
static void pci_pir_create_links(struct PIR_entry *entry,
struct PIR_intpin *intpin, void *arg);
static void pci_pir_dump_links(void);
static struct pci_link *pci_pir_find_link(uint8_t link_id);
static void pci_pir_find_link_handler(struct PIR_entry *entry,
struct PIR_intpin *intpin, void *arg);
static void pci_pir_initial_irqs(struct PIR_entry *entry,
struct PIR_intpin *intpin, void *arg);
static void pci_pir_parse(void);
static uint8_t pci_pir_search_irq(int bus, int device, int pin);
static int pci_pir_valid_irq(struct pci_link *pci_link, int irq);
static void pci_pir_walk_table(pir_entry_handler *handler, void *arg);
static MALLOC_DEFINE(M_PIR, "$PIR", "$PIR structures");
static struct PIR_table *pci_route_table;
static device_t pir_device;
static int pci_route_count, pir_bios_irqs, pir_parsed;
static TAILQ_HEAD(, pci_link) pci_links;
static int pir_interrupt_weight[NUM_ISA_INTERRUPTS];
/* sysctl vars */
SYSCTL_DECL(_hw_pci);
/* XXX this likely should live in a header file */
#ifdef PC98
/* IRQs 3, 5, 7, 9, 10, 11, 12, 13 */
#define PCI_IRQ_OVERRIDE_MASK 0x3e68
#else
/* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */
#define PCI_IRQ_OVERRIDE_MASK 0xdef8
#endif
static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK;
SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN,
&pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK,
"Mask of allowed irqs to try to route when it has no good clue about\n"
"which irqs it should use.");
/*
* Look for the interrupt routing table.
*
* We use PCI BIOS's PIR table if it's available. $PIR is the standard way
* to do this. Sadly, some machines are not standards conforming and have
* _PIR instead. We shrug and cope by looking for both.
*/
void
pci_pir_open(void)
{
struct PIR_table *pt;
uint32_t sigaddr;
int i;
uint8_t ck, *cv;
/* Don't try if we've already found a table. */
if (pci_route_table != NULL)
return;
/* Look for $PIR and then _PIR. */
sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0);
if (sigaddr == 0)
sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0);
if (sigaddr == 0)
return;
/* If we found something, check the checksum and length. */
/* XXX - Use pmap_mapdev()? */
pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
if (pt->pt_header.ph_length <= sizeof(struct PIR_header))
return;
for (cv = (u_int8_t *)pt, ck = 0, i = 0;
i < (pt->pt_header.ph_length); i++)
ck += cv[i];
if (ck != 0)
return;
/* Ok, we've got a valid table. */
pci_route_table = pt;
pci_route_count = (pt->pt_header.ph_length -
sizeof(struct PIR_header)) /
sizeof(struct PIR_entry);
}
/*
* Find the pci_link structure for a given link ID.
*/
static struct pci_link *
pci_pir_find_link(uint8_t link_id)
{
struct pci_link *pci_link;
TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
if (pci_link->pl_id == link_id)
return (pci_link);
}
return (NULL);
}
/*
* Find the link device associated with a PCI device in the table.
*/
static void
pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin,
void *arg)
{
struct pci_link_lookup *lookup;
lookup = (struct pci_link_lookup *)arg;
if (entry->pe_bus == lookup->bus &&
entry->pe_device == lookup->device &&
intpin - entry->pe_intpin == lookup->pin)
*lookup->pci_link_ptr = pci_pir_find_link(intpin->link);
}
/*
* Check to see if a possible IRQ setting is valid.
*/
static int
pci_pir_valid_irq(struct pci_link *pci_link, int irq)
{
if (!PCI_INTERRUPT_VALID(irq))
return (0);
return (pci_link->pl_irqmask & (1 << irq));
}
/*
* Walk the $PIR executing the worker function for each valid intpin entry
* in the table. The handler is passed a pointer to both the entry and
* the intpin in the entry.
*/
static void
pci_pir_walk_table(pir_entry_handler *handler, void *arg)
{
struct PIR_entry *entry;
struct PIR_intpin *intpin;
int i, pin;
entry = &pci_route_table->pt_entry[0];
for (i = 0; i < pci_route_count; i++, entry++) {
intpin = &entry->pe_intpin[0];
for (pin = 0; pin < 4; pin++, intpin++)
if (intpin->link != 0)
handler(entry, intpin, arg);
}
}
static void
pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin,
void *arg)
{
struct pci_link *pci_link;
pci_link = pci_pir_find_link(intpin->link);
if (pci_link != NULL) {
pci_link->pl_references++;
if (intpin->irqs != pci_link->pl_irqmask) {
if (bootverbose)
printf(
"$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n",
entry->pe_bus, entry->pe_device,
(intpin - entry->pe_intpin) + 'A',
pci_link->pl_id);
pci_link->pl_irqmask &= intpin->irqs;
}
} else {
pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK);
pci_link->pl_id = intpin->link;
pci_link->pl_irqmask = intpin->irqs;
pci_link->pl_irq = PCI_INVALID_IRQ;
pci_link->pl_references = 1;
pci_link->pl_routed = 0;
TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links);
}
}
/*
* Look to see if any of the function on the PCI device at bus/device have
* an interrupt routed to intpin 'pin' by the BIOS.
*/
static uint8_t
pci_pir_search_irq(int bus, int device, int pin)
{
uint32_t value;
uint8_t func, maxfunc;
/* See if we have a valid device at function 0. */
value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
return (PCI_INVALID_IRQ);
if (value & PCIM_MFDEV)
maxfunc = PCI_FUNCMAX;
else
maxfunc = 0;
/* Scan all possible functions at this device. */
for (func = 0; func <= maxfunc; func++) {
value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
if (value == 0xffffffff)
continue;
value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
/*
* See if it uses the pin in question. Note that the passed
* in pin uses 0 for A, .. 3 for D whereas the intpin
* register uses 0 for no interrupt, 1 for A, .. 4 for D.
*/
if (value != pin + 1)
continue;
value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
if (bootverbose)
printf(
"$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n",
bus, device, pin + 'A', func, value);
if (value != PCI_INVALID_IRQ)
return (value);
}
return (PCI_INVALID_IRQ);
}
/*
* Try to initialize IRQ based on this device's IRQ.
*/
static void
pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin,
void *arg)
{
struct pci_link *pci_link;
uint8_t irq, pin;
pin = intpin - entry->pe_intpin;
pci_link = pci_pir_find_link(intpin->link);
irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin);
if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq)
return;
/* Don't trust any BIOS IRQs greater than 15. */
if (irq >= NUM_ISA_INTERRUPTS) {
printf(
"$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n",
irq, entry->pe_bus, entry->pe_device, pin + 'A',
pci_link->pl_id);
return;
}
/*
* If we don't have an IRQ for this link yet, then we trust the
* BIOS, even if it seems invalid from the $PIR entries.
*/
if (pci_link->pl_irq == PCI_INVALID_IRQ) {
if (!pci_pir_valid_irq(pci_link, irq))
printf(
"$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n",
irq, entry->pe_bus, entry->pe_device, pin + 'A',
pci_link->pl_id);
pci_link->pl_irq = irq;
pci_link->pl_routed = 1;
return;
}
/*
* We have an IRQ and it doesn't match the current IRQ for this
* link. If the new IRQ is invalid, then warn about it and ignore
* it. If the old IRQ is invalid and the new IRQ is valid, then
* prefer the new IRQ instead. If both IRQs are valid, then just
* use the first one. Note that if we ever get into this situation
* we are having to guess which setting the BIOS actually routed.
* Perhaps we should just give up instead.
*/
if (!pci_pir_valid_irq(pci_link, irq)) {
printf(
"$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n",
irq, entry->pe_bus, entry->pe_device, pin + 'A',
pci_link->pl_id);
} else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) {
printf(
"$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n",
irq, entry->pe_bus, entry->pe_device, pin + 'A',
pci_link->pl_id, pci_link->pl_irq);
pci_link->pl_irq = irq;
pci_link->pl_routed = 1;
} else
printf(
"$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n",
irq, entry->pe_bus, entry->pe_device, pin + 'A',
pci_link->pl_id, pci_link->pl_irq);
}
/*
* Parse $PIR to enumerate link devices and attempt to determine their
* initial state. This could perhaps be cleaner if we had drivers for the
* various interrupt routers as they could read the initial IRQ for each
* link.
*/
static void
pci_pir_parse(void)
{
char tunable_buffer[64];
struct pci_link *pci_link;
int i, irq;
/* Only parse once. */
if (pir_parsed)
return;
pir_parsed = 1;
/* Enumerate link devices. */
TAILQ_INIT(&pci_links);
pci_pir_walk_table(pci_pir_create_links, NULL);
if (bootverbose) {
printf("$PIR: Links after initial probe:\n");
pci_pir_dump_links();
}
/*
* Check to see if the BIOS has already routed any of the links by
* checking each device connected to each link to see if it has a
* valid IRQ.
*/
pci_pir_walk_table(pci_pir_initial_irqs, NULL);
if (bootverbose) {
printf("$PIR: Links after initial IRQ discovery:\n");
pci_pir_dump_links();
}
/*
* Allow the user to override the IRQ for a given link device. We
* allow invalid IRQs to be specified but warn about them. An IRQ
* of 255 or 0 clears any preset IRQ.
*/
i = 0;
TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
snprintf(tunable_buffer, sizeof(tunable_buffer),
"hw.pci.link.%#x.irq", pci_link->pl_id);
if (getenv_int(tunable_buffer, &irq) == 0)
continue;
if (irq == 0)
irq = PCI_INVALID_IRQ;
if (irq != PCI_INVALID_IRQ &&
!pci_pir_valid_irq(pci_link, irq) && bootverbose)
printf(
"$PIR: Warning, IRQ %d for link %#x is not listed as valid\n",
irq, pci_link->pl_id);
pci_link->pl_routed = 0;
pci_link->pl_irq = irq;
i = 1;
}
if (bootverbose && i) {
printf("$PIR: Links after tunable overrides:\n");
pci_pir_dump_links();
}
/*
* Build initial interrupt weights as well as bitmap of "known-good"
* IRQs that the BIOS has already used for PCI link devices.
*/
TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
if (!PCI_INTERRUPT_VALID(pci_link->pl_irq))
continue;
pir_bios_irqs |= 1 << pci_link->pl_irq;
pir_interrupt_weight[pci_link->pl_irq] +=
pci_link->pl_references;
}
if (bootverbose) {
printf("$PIR: IRQs used by BIOS: ");
pci_print_irqmask(pir_bios_irqs);
printf("\n");
printf("$PIR: Interrupt Weights:\n[ ");
for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
printf(" %3d", i);
printf(" ]\n[ ");
for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
printf(" %3d", pir_interrupt_weight[i]);
printf(" ]\n");
}
}
/*
* Use the PCI BIOS to route an interrupt for a given device.
*
* Input:
* AX = PCIBIOS_ROUTE_INTERRUPT
* BH = bus
* BL = device [7:3] / function [2:0]
* CH = IRQ
* CL = Interrupt Pin (0x0A = A, ... 0x0D = D)
*/
static int
pci_pir_biosroute(int bus, int device, int func, int pin, int irq)
{
struct bios_regs args;
args.eax = PCIBIOS_ROUTE_INTERRUPT;
args.ebx = (bus << 8) | (device << 3) | func;
args.ecx = (irq << 8) | (0xa + pin);
return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)));
}
/*
* Route a PCI interrupt using a link device from the $PIR.
*/
int
pci_pir_route_interrupt(int bus, int device, int func, int pin)
{
struct pci_link_lookup lookup;
struct pci_link *pci_link;
int error, irq;
if (pci_route_table == NULL)
return (PCI_INVALID_IRQ);
/* Lookup link device for this PCI device/pin. */
pci_link = NULL;
lookup.bus = bus;
lookup.device = device;
lookup.pin = pin - 1;
lookup.pci_link_ptr = &pci_link;
pci_pir_walk_table(pci_pir_find_link_handler, &lookup);
if (pci_link == NULL) {
printf("$PIR: No matching entry for %d.%d.INT%c\n", bus,
device, pin - 1 + 'A');
return (PCI_INVALID_IRQ);
}
/*
* Pick a new interrupt if we don't have one already. We look
* for an interrupt from several different sets. First, if
* this link only has one valid IRQ, use that. Second, we
* check the set of PCI only interrupts from the $PIR. Third,
* we check the set of known-good interrupts that the BIOS has
* already used. Lastly, we check the "all possible valid
* IRQs" set.
*/
if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) {
if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask))
irq = ffs(pci_link->pl_irqmask) - 1;
else
irq = pci_pir_choose_irq(pci_link,
pci_route_table->pt_header.ph_pci_irqs);
if (!PCI_INTERRUPT_VALID(irq))
irq = pci_pir_choose_irq(pci_link, pir_bios_irqs);
if (!PCI_INTERRUPT_VALID(irq))
irq = pci_pir_choose_irq(pci_link,
pci_irq_override_mask);
if (!PCI_INTERRUPT_VALID(irq)) {
if (bootverbose)
printf(
"$PIR: Failed to route interrupt for %d:%d INT%c\n",
bus, device, pin - 1 + 'A');
return (PCI_INVALID_IRQ);
}
pci_link->pl_irq = irq;
}
/* Ask the BIOS to route this IRQ if we haven't done so already. */
if (!pci_link->pl_routed) {
error = pci_pir_biosroute(bus, device, func, pin - 1,
pci_link->pl_irq);
/* Ignore errors when routing a unique interrupt. */
if (error && !powerof2(pci_link->pl_irqmask)) {
printf("$PIR: ROUTE_INTERRUPT failed.\n");
return (PCI_INVALID_IRQ);
}
pci_link->pl_routed = 1;
/* Ensure the interrupt is set to level/low trigger. */
KASSERT(pir_device != NULL, ("missing pir device"));
BUS_CONFIG_INTR(pir_device, pci_link->pl_irq,
INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
}
if (bootverbose)
printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device,
pin - 1 + 'A', pci_link->pl_irq);
return (pci_link->pl_irq);
}
/*
* Try to pick an interrupt for the specified link from the interrupts
* set in the mask.
*/
static int
pci_pir_choose_irq(struct pci_link *pci_link, int irqmask)
{
int i, irq, realmask;
/* XXX: Need to have a #define of known bad IRQs to also mask out? */
realmask = pci_link->pl_irqmask & irqmask;
if (realmask == 0)
return (PCI_INVALID_IRQ);
/* Find IRQ with lowest weight. */
irq = PCI_INVALID_IRQ;
for (i = 0; i < NUM_ISA_INTERRUPTS; i++) {
if (!(realmask & 1 << i))
continue;
if (irq == PCI_INVALID_IRQ ||
pir_interrupt_weight[i] < pir_interrupt_weight[irq])
irq = i;
}
if (bootverbose && PCI_INTERRUPT_VALID(irq)) {
printf("$PIR: Found IRQ %d for link %#x from ", irq,
pci_link->pl_id);
pci_print_irqmask(realmask);
printf("\n");
}
return (irq);
}
static void
pci_print_irqmask(u_int16_t irqs)
{
int i, first;
if (irqs == 0) {
printf("none");
return;
}
first = 1;
for (i = 0; i < 16; i++, irqs >>= 1)
if (irqs & 1) {
if (!first)
printf(" ");
else
first = 0;
printf("%d", i);
}
}
/*
* Display link devices.
*/
static void
pci_pir_dump_links(void)
{
struct pci_link *pci_link;
printf("Link IRQ Rtd Ref IRQs\n");
TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
printf("%#4x %3d %c %3d ", pci_link->pl_id,
pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N',
pci_link->pl_references);
pci_print_irqmask(pci_link->pl_irqmask);
printf("\n");
}
}
/*
* See if any interrupts for a given PCI bus are routed in the PIR. Don't
* even bother looking if the BIOS doesn't support routing anyways. If we
* are probing a PCI-PCI bridge, then require_parse will be true and we should
* only succeed if a host-PCI bridge has already attached and parsed the PIR.
*/
int
pci_pir_probe(int bus, int require_parse)
{
int i;
if (pci_route_table == NULL || (require_parse && !pir_parsed))
return (0);
for (i = 0; i < pci_route_count; i++)
if (pci_route_table->pt_entry[i].pe_bus == bus)
return (1);
return (0);
}
/*
* The driver for the new-bus psuedo device pir0 for the $PIR table.
*/
static int
pir_probe(device_t dev)
{
char buf[64];
snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries",
pci_route_count);
device_set_desc_copy(dev, buf);
return (0);
}
static int
pir_attach(device_t dev)
{
pci_pir_parse();
KASSERT(pir_device == NULL, ("Multiple pir devices"));
pir_device = dev;
return (0);
}
static void
pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin,
void *arg)
{
struct pci_dev_lookup *pd;
pd = (struct pci_dev_lookup *)arg;
if (intpin->link != pd->link || pd->bus != -1)
return;
pd->bus = entry->pe_bus;
pd->device = entry->pe_device;
pd->pin = intpin - entry->pe_intpin;
}
static int
pir_resume(device_t dev)
{
struct pci_dev_lookup pd;
struct pci_link *pci_link;
int error;
/* Ask the BIOS to re-route each link that was already routed. */
TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) {
KASSERT(!pci_link->pl_routed,
("link %#x is routed but has invalid PCI IRQ",
pci_link->pl_id));
continue;
}
if (pci_link->pl_routed) {
pd.bus = -1;
pd.link = pci_link->pl_id;
pci_pir_walk_table(pir_resume_find_device, &pd);
KASSERT(pd.bus != -1,
("did not find matching entry for link %#x in the $PIR table",
pci_link->pl_id));
if (bootverbose)
device_printf(dev,
"Using %d.%d.INT%c to route link %#x to IRQ %d\n",
pd.bus, pd.device, pd.pin + 'A',
pci_link->pl_id, pci_link->pl_irq);
error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin,
pci_link->pl_irq);
if (error)
device_printf(dev,
"ROUTE_INTERRUPT on resume for link %#x failed.\n",
pci_link->pl_id);
}
}
return (0);
}
static device_method_t pir_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, pir_probe),
DEVMETHOD(device_attach, pir_attach),
DEVMETHOD(device_resume, pir_resume),
{ 0, 0 }
};
static driver_t pir_driver = {
"pir",
pir_methods,
1,
};
static devclass_t pir_devclass;
DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, 0, 0);